如果f'(x)存在，则(∫df(x))'=( )．

听力原文：W: Pate! Hi, remember me？

M: Mary. Mary Lamb. Oh, yes. I remember you.

W: Yeah, we met at Bill' s party.

Where did they first meet？

A．At a ranch.

B．At school.

C．At a party.

D．At a dance.

--Mary cares little about money -- __________ .

A.So do I

B.I am, too

C.Not do I

D.Neither do I

听力原文：F: I'm afraid I can't remember you.

M: Pm Mike. Mary, your classmate, is my friend. Don't you remember we met each other at an evening party？

When did they meet the first time？

A．One evening.

B．One morning.

C．In the evening.

Yang Mei: Hello, my name is Yang Mei. Mary Ann: Hi, I’m Mary Ann. Yang Mei: Are you studying Chinese here？ Mary Ann: Yes, I’m new here. Yang Mei: Where are you from？ Mary Ann: Australia, Perth. Heard about it？ Yang Mei: No, not really. I really like your dress. How much did it cost？ Mary Ann: Well, eh, I don’t remember for sure. Yang Mei: Your shoes are nice, too. Where did you get them？ Did you get them in a sale？ Mary Ann: I can’t remember. I must go now. See you later. Question: Is this a successful verbal communication？ Why or why not？

Mary: Hi, Peter! Going away for the holidays, right？

Peter; Yes, I am. ___51 ___？

Mary: Well, I&39;m going to stay in the city.

Peter: What are you going to do then？Mary: ___52___

Peter: ___53_？

Mary:No, never in a store, but I can learn.

Peter:___ 54_？

Mary:I need money for school next term, and I can get some experience. So, ___55___ again？

Peter: Yes. I&39;ve gone camping four times. It&39;s wonderful at a summer camp.

Mary: Well, Peter, enjoy your holidays!Peter:&39; You too. See you!